Electrostatics Archives

41. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of

2 joules

4 joules

6 joules

8 joules

Detailed SolutionWhen 4 volts e.m.f.

is applied across a 1 farad capacitor, it will store energy of

42. Mica capacitors are characterised by all of the following except

stable operation

accurate value

low leakage reactance

low losses

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href="https://exam.pscnotes.com/mcq/mica-capacitors-are-characterised-by-all-of-the-following-except/#more-45818">Detailed Solution

43. In a cable capacitor, voltage gradient is maximum at the surface of the

earth

conduction

sheath

insulator

Detailed

Solution

44. The unit of capacitance is

henry

ohm

farad

farad/m

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class="read-more button" href="https://exam.pscnotes.com/mcq/the-unit-of-capacitance-is/#more-45137">Detailed Solution

45. The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to . . . . . . . . percent of its . . . . . . . . value.

37, initial

62, initial

62, final

37, final

Detailed SolutionThe time constant of an R-C circuit is defined as the time during which capacitor charging voltage

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actually rises to . . . . . . . . percent of its . . . . . . . . value.

46. An electrolytic capacitor is generally made to provide

low capacitance

fixed capacitance

variable capacitance

large value of capacitance

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11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube button" href="https://exam.pscnotes.com/mcq/an-electrolytic-capacitor-is-generally-made-to-provide/#more-44789">Detailed Solution

47. Which of the following capacitors preferred for high frequency circuits ?

Air capacitor

Electrolytic capacitor

Mica capacitor

none of the above

Detailed Solution

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class="screen-reader-text">Which of the following capacitors preferred for high frequency circuits ?

48. If three 15 uF capacitors are connected in series, the net capacitance is

5 uF

30 uF

45 uF

50 uF

Detailed SolutionIf

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three 15 uF capacitors are connected in series, the net capacitance is

49. Out of the following capacitors of identical rating which one will have the smallest dimensions ?

Aluminium foil capacitor

Mica capacitor

Ceramic capacitor

Paper capacitor

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dimensions ?" class="read-more button" href="https://exam.pscnotes.com/mcq/out-of-the-following-capacitors-of-identical-rating-which-one-will-have-the-smallest-dimensions/#more-43959">Detailed Solution

50. If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will

decrease

increase

remains unchanged

become zero

Detailed SolutionIf the sheet of a

bakelite is inserted between the plates of an air capacitor, the capacitance will

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